Answer:
The seal
Step-by-step explanation:
This question depicts a typical food chain, which is the linear relationship that shows the transfer of energy from one organism to another. Every food chain consists of organism in trophic levels. One organism in each trophic level. The food chain starts with a PRIMARY PRODUCER, which is the algae in this case.
The fish is the PRIMARY CONSUMER because it feeds directly on the algae (producer). The secondary consumer is the SEAL, which feeds on the fish. The summarized food chain is as follows;
Algae → Fish → Seal → Bear → Bacteria